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Inhibition Mechanism of Phosphate Ions on Chloride-Induced Crevice Corrosion of Alloy 22

Published on May 1, 2015in Corrosion1.86
· DOI :10.5006/1373
Marcela Miyagusuku1
Estimated H-index: 1
,
Ricardo M. Carranza10
Estimated H-index: 10
,
Raul B. Rebak19
Estimated H-index: 19
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Abstract
Alloy 22, a nickel-based alloy that belongs to the Ni-Cr-Mo family, shows an outstanding corrosion resistance in most environments. Alloy 22 was extensively studied regarding its crevice corrosion behavior both in pure chloride solutions and in solutions containing other ions such as nitrate, sulfate, and carbonate/bicarbonate. Electrochemical tests were performed to study uniform and localized corrosion of Alloy 22 in a deaerated aqueous solution of 1 M NaCl and 1 M NaCl with different amounts of phosphate additions at 90°C and at pH near neutral. Results show that the addition of phosphate to the solution increased the length of the passive potential range. Moreover, results from two type of electrochemical tests showed that the addition of 0.3 M phosphate and higher completely eliminated the susceptibility of Alloy 22 to crevice corrosion. The excellent inhibitive effect of phosphate is comparable to that of nitrate already reported in the literature. Elemental analysis of the corroded area suggests th...
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  • Citations (4)
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References40
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#1M. Rincón Ortíz (CONICET: National Scientific and Technical Research Council)H-Index: 3
#2M.A. Rodríguez (CONICET: National Scientific and Technical Research Council)H-Index: 3
Last.Raul B. Rebak (GE: General Electric)H-Index: 19
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#1Pellumb Jakupi (UWO: University of Western Ontario)H-Index: 12
#2Fengping Wang (USTB: University of Science and Technology Beijing)H-Index: 5
Last.D.W. Shoesmith (UWO: University of Western Ontario)H-Index: 27
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#1Martén A. Rodríguez (National Atomic Energy Commission)H-Index: 2
#2R M CarranzaH-Index: 3
Last.Raul B. RebakH-Index: 19
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#1Xihua He (SwRI: Southwest Research Institute)H-Index: 5
#2Blair K. Brettmann (SwRI: Southwest Research Institute)H-Index: 10
Last.Hundal Jung (SwRI: Southwest Research Institute)H-Index: 3
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View next paperCrevice corrosion of nickel superalloy in deaerated chloride/sulphate solution at 90°C